Common axis labels pgfplots

pgfplots

Is there a simple way of making a common x-axis label?

I have referred to this:
Common x-axis label in different rows of pgfplots mult

and the solution appears very complex and doesn't work for me.

Here is a my MWE:

\documentclass{standalone}
\usepackage{siunitx}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
\usepackage[sfdefault]{atkinson}
\begin{document}
\begin{tikzpicture}
\begin{axis}[xlabel={Work},
ylabel={Effort},
title={Graphpart 1}]
\addplot[no marks]{x^2+x+2};
\end{axis}
\end{tikzpicture}
\begin{tikzpicture}
\begin{axis}[xlabel={Work},
ylabel={Effort},
title={Graphpart 2}]
\addplot[only marks, red, mark size=1pt]{x^3+x+2};
\end{axis}
\end{tikzpicture}
\end{document}

Which produces this output:
Test_image

I would like Work to be in the centre as the common x-axis label.

Best Answer

You really should use a groupplot. But, for now you can use a slightly hackish method and that is to use xlabel style to position the xlabel:

xlabel style = {
    at={(ticklabel cs:0)},
    anchor=north east,
    xshift=-0.35cm,
},

A \vphantom{} was applied to the first graph's xlabel to ensure that the x-axis was located at the same spot vertically.

enter image description here

Code:

\documentclass{article}
\usepackage{siunitx}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}
\usepackage[sfdefault]{atkinson}

\begin{document}
\noindent
\begin{tikzpicture}
    \begin{axis}[
    xlabel={\vphantom{Work}},
    ylabel={Effort},
    title={Graphpart 1}]
    \addplot[no marks]{x^2+x+2};
    \end{axis}
    \end{tikzpicture}
    \begin{tikzpicture}
    \begin{axis}[xlabel={Work},
    ylabel={Effort},
    title={Graphpart 2},
    xlabel style = {
        at={(ticklabel cs:0)},
        anchor=north east,
        xshift=-0.35cm,
    },
    ]
    \addplot[only marks, red, mark size=1pt]{x^3+x+2};
    \end{axis}
\end{tikzpicture}%
\end{document}
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